Dental tool holder or clutch.



:116.616,069. BATENTBDMAR. 27,1966.

' B.s.1s1wwN,D1EcyD.y Y

y S. A. BROWN, EXEOUTOB.: l

- l DBNML TopL HOLDER 0R CLUTCH.

APPLICATION FILED DEO 9 1903 url.;`

. Elrawn. Inventor.;

the' village 'tate-V Qff Massachusetts,- have inofionsejtjngthe county of Plymventedla'new-Dental` Tool Hold er or `Clutch, 1

of-lwhich'fthefollowin'g is a specification.

yjMy invention relates to clutching devices yapplicable to different purposes, and is intendthe inventionis shown as applied to a dentaly ed to-.1holdi'-orclamp cylindrical toolsor other objects 0 1.` 139i perform-1a similar office in various vn iechanic'al devices. j

drills, 5&0. can beheld while the hand iecespindle isfrevolved the power from a a ental en nerpff; f

his invention belongszto that class of dei.,`

Vices wherein a Split vand elastic hollow cylin-"f'l der or chuck is compressed upon the. tool or frictionthuscreated; f. -f

Figure +1 is 1a viewpartly yin section of a dental4 hand iece. Fig'; 2 is ay view ofthe rotatablel shat fand :mechanism for operating aft in`sectionwithy a'portion of the operatshaft:y and vsleeve with device to prevent disengagement -fv clutch; Fig-6, another view of same modification; Fig'. 7, a cross-section of sleeve., taken through dotted line fift, Fig. 2.

l8 showsleverreversed.

is internally screwthreaded at its rear end to ingl mechanism in the position after compressf' l ing thefchuck."v Fig. 5 1s a modified form of receive `abearing-Lhlock I, which supports the rear end of the shaft'. The shaft B 1s adaptl ed tofrotate;` in thecase'A, is beveled atits forward end to fit intoea corresponding bearing in the case, is slotted a bto receive the le'- ver D and the screw g, and the rear end bears in or againstthe block l.

The split chuck C is coned at both ends and end to connect with the outer sheath L, coverfits vinto rthe shaft B, one end in a tapered,

socket of the shaft, the other in a corresponding-socket inthe follower H, which is immediatel behind the chuck and in front of the lever. which works inthe slot b and abuts against the vadjustable ulcrum E, which 1s threaded and adapted to turn and-moveforward and backwardy inthe threaded portion F. The proper screw is obtaine the de th'thatath DE-.annate...erben-ienwat.:

' Specification of Letters'lgatent; Patented March 27, 1906.

Application mea 'nmmbe r9.19oe.' steunt.' 184,506; Y'

of the shaftB and 4is slotted at its rear end tovv 4receive a screw-driver and may have several holesbored diametrcally through to receive-` a small rod or needle for'turning it, although theseholes arenot necessary, the adjustment by theffscrew-driver sufiicing.` This ad'ustment isfor taking up wear and vprimarily to regulate the position of the sleeve F relative to the lever D, which it operates. The adjusting-screw E having transverse holes,lis applicable to other forms of clutching devices con- -iIn thlsvsp'ecification and attached drawings ressure of the screw E, actin againstthe tool,; `.holdjer-.-or.handp1ece in which burs,

eel .of the lever D, throws up t e arm of the tactvwith the channel or groove ain the sleeve lever to thedesired degree necessary for con- 1 0 osition of the lever vand by first inserting a tool- 4 shank in the chuck C and turning the adjust? 1 ing-screw E so thatwhen the sleeve E "is' 75 pulled backward to a position approximatelyl halfI its throw the tool will befheld firmly, as shown in Fig. 4.

The sleeve F slides on the shaftl'is cut away, as showm thereby formingI af slot to .make rooinfor the lever D, and at its front end has an'inclined recess a, adapted to re ceive the 'lever-arm.

' A sliding rod Genters the rear of the. shaft.

B, has a boss I7.6," and 'is adapted toconnect at itsrearend wtltthe cable of a dental e ne, and united to the sleeve F .b a screwg,w 'ch passes through` the sleeve the slot bl in thejf curing the rotation of the shaft when the engine-cable isturned,'while allowing the rod shaft B andenters the rod G, thereby 3e? Il" vThe bearing-block I is screw-threaded and has, anadjustable rin J on the outside, securedby a set-screw block enters t e case A.'y

' said rin regulating I :A s eeve adapted to slide within ,thie. 'y block I, is enlarged and threaded at its rear u ing the liexible shaft of a dental engine, is'r'ecessed atythis partto receive the boss k of the IOO ment therein, but allows it to rotate freely, so f that the endwise motion of both `sheath and bushing will be imparted to the rod G and the yconnected clutch mechanisms.

The modified form of sleeve and shaft is shown in Figs. 5, 6. The shaft B has corrugations mfor a short distance opposite the slot b. The sleeve F is split, as shown, to form a narrow` tongue o, which is turned up at the end to form a projection or-tooth w, which engages with the notches m, the elasticity of the meta-l allowing the tongue a slight movement. The object of this con struction is to insure against the accidental loosening of the clutch but it is not absolutely necessary, because the friction between the sleeve F and the arm of the lever is sufficient under ordinary conditions to retain the parts in osition.

The action of t e instrument is as follows: The position of the parts is supposed to be as shown in Fig. 1. A tool 1' is inserted. The

part K and attached sheath L are now pulledl rearward. This causes the rod G andat tached sleeve F to make a similar movement, thereby crowding the arm of the lever D downward or toward the center of the shaft B. Acting against the fulcrum E, thelever forces the follower H forward and against the beveled chuck C, whose ends are thereby compressed and contracted upon the tool 1. An opposite movement releases the pressure on the lever D and follower H, allowing the chuck C to o en by its own elasticity and release its hol upon the tool.

I do not confine myself to the particular .form of chuck or arrangement of chuck, le-

ver, and sleeve here shown. A single split chuck or chuck and follower combined may be used. So, also, the position of the lever and sleeve can be reversed without changing the princi le of my invention. In that case a forwar motion of the sleeve closes .the chuck. An opposite movement releases it, as shown in Flg. 8, where the rear end of the follower H is tapered to make room for the lever-arm and the fulcrum E' is shorter than in the first plan.

I claim- 1. In a dental tool-holder, a hollow shaft carrying an endwise-movable tool-holding chuck, a lever, a lengthwise-movable connectionbetween the chuck and the lever, an adjustable screw-fulcrum for the lever adapted to move len thwise in the shaft and means to operate the ever. I

2. In a dental tool-holder a hollow shaft carrying an endwise-movable tool-holdlng chuck, a lever, a lengthwise-movable connection between the chuck and the lever, an adjustable screw-fulcrum for the lever adapted to move lengthwise in the shaft and a sleeve adapted to slide lengthwise on the outs1de of the shaft, in contact with and for the purpose of actuating the lever, substantially as set forth.

3. In a dental tool-holder a hollow shaft carrying an endwisemovable tool-holding chuck,l a lever, a lengthwise-Inovable connection between the chuck and the lever, an ad justable screw-fulcrum for the lever adapted to move lengthwise in the shaft and havin;7 holes in its periphery for the purpose di scribed, and means to operate the lever.

4. In a dental tool-holder the combination of a hollow shaft slotted for a portion of its length a tool-holding chuck mounted therein, a sleeve adapted to slide longitudinally on the outside of the shaft, o erative connortions between the tool-chuc and the sliding sleeve, a rod in the rearward art of the shaft adapted to slide lengthwise t erein and connected with the sleeve whereby the motion of said rod will actuate the sleeve and connected mechanism.

5. In a dental tool-holder the combination of a shaft slotted for a ortion. of its length and containing a tool-ho ding chuck, a lever,

`a lengthwise-movable connect-ion' between the chuck and the lever, a sleeve adapted to slide lengthwise on the outside of the shaf t in contact with and for the urpose of actuating the lever, and a rod in tie rearward part of the shaft adapted to slide lengthwise therein and connect-ed with the sleeve, whereby the motion of said rod will move the sleeve Aand connected mechanism.

6. In a dental tool-holder the combination of a hollow shaft slotted for a portion of its length, an endwise movable tool holding chuck, a lever, a lengthwise-movable connection between the chuck and the lever, all contained within the shaft, a sleeve adapt-ed to slide lengthwiseon the outside of the shaft in contactwith and-for the purpose of actuating the lever, said-.sleeve having a longitudinal slot in its periphery to receive the lever-arm.

7. The combination'ofa hollow shaft having transverse grooves in a ortion of its periphery and a longitudinal s ot, with an endwise movable toolclutching device inside and al sleeve on the outside of the shaft and means for operatively connecting the sleeve with the clutching device, said sleeve having an elastic tongue or'spring adapted to engage with the ooves on the shaft forthe purpose set fort and descrlbed.

BENoNI sBRowN.

Witnesses: i

s CHARLES A. ROBBINS,

JAS. H. YOUNG.

IOO

IQS 

